Paleoproterozoic
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The Paleoproterozoic Era is the first of the three sub-divisions of the Proterozoic eon, and also the longest era of the Earth's geological history, spanning from 2,500 to 1,600 million years ago. It
Paleoproterozoic stromatolites
Siderian
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The Siderian is the first geologic period in the Paleoproterozoic Era and Proterozoic Eon. It lasted from 2500 to 2300 million years ago, spanning 200 million years, and is followed by the Rhyacian Pe
Paleoproterozoic
…Earth's geological history, spanning from 2,500 to 1,600 million years ago (2.5–1.6 Ga). It is further subdivided into four geologic periods, namely the Siderian, Rhyacian, Orosirian and Statherian. Paleontological evidence suggests that the Earth's rotational rate ~1.8 billion years ago equated to 20-hour days…
A Siderian banded iron formation in Dales Gorge, Western Australia
Artist's impression of the Earth during the Huronian glaciation, starting from the mid-Siderian
Gray Badcallian gneiss (c. 2500 Ma) intruded by a dark amphibolitic Scourie dike (c. 2400 Ma), both intruded by younger granitic veins